fixed typo in deploy.yml

Author: ray-chew

.github/workflows/deploy.yml

@@ -22,7 +22,7 @@ jobs:
           pip install .
       - name: Sphinx build
         run: |
-          sphinx-build docs/source _buil
+          sphinx-build docs/source _build
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}